Oil pump parameters:
- oil pressure:
- at idle 0.5 kgf/cm2;
- at a frequency of 2000 min-1 3 - 4 kgf/cm2;
- at a frequency of 4000 min-1 4 - 5 kgf/cm2;
- maximum radial clearance between the outer rotor and the housing - 0.18 mm;
- axial clearance:
- between rotors 0.08 mm;
- inner rotor, maximum 0.08mm;
- outer rotor 0.09 mm;
- between the rotors and the plane of the pump housing 0.04 - 0.09 mm.
After the oil filter, a pressure reducing valve is installed, which, when the pressure rises above the set value, dumps excess oil into the oil bath (pallet). If the filter is clogged, the bypass valve directs the unfiltered oil directly into the pressure line. Reducing valve opening pressure 4.2±0.5 kgf/cm2.
A non-return valve is installed in the oil filter fitting, which prevents oil from flowing out of the channels and hydraulic valve compensators after the engine is stopped.
The purified oil flows through the pressure line and its branches to the main bearings of the crankshaft. Through inclined drillings in the body of the crankshaft, oil enters its connecting rod journals and sprays to the piston pins and cylinder mirrors. At the same time, engine oil flows through vertical channels into the cylinder head to the camshaft bearings, cylindrical hydraulic compensators of the valve drive levers, valve guides, and to the timing chain tensioners.